Method of making packing



March 8,1933. w. J. MARSHALL 2,110,303

METHOD OF MAKINGPACKING v Filed oct. 3o, 1935 i Patented Mn. s, 193s METHOD F Framing or to George `0. Jenkins Company', Bridgewater, Mass., a corporation of Massachusetts PATENT," oFFiCE HAKING PACKING hun, Mass., assign- I Application ombe- 30. 193s, serial No. 41.391

s cmu (ci. 154-2) comprising a layer of relatively flexible sheet material of water, grease and oil repellent or proof material, provided with an opening throughV which the axle may extend, the margin of the opening being stretchable to make sealing contact with the axle even though its diameter may be anything between somewhat wide limits.

In accordance with this invention the packing is formed up from a bias strip of suitable woven fabric such as asbestos cloth with or without wire reinforcing. 'I'his is folded about a length of flexible tubing and secured face to face beyond 'this tubing. This tubing is thereafter bent to annular form and is secured in such condition by suitable means. The sheet material is then flattened out to lie substantially in a plane, the folded. portion containing the tubing forming a rounded stretchable bead preferably lying at one side of the general plane of the sheet material. 'Ihis sheet material is then treated with suitable agents to render it oil and water resistant, or proof, and with a lubricant which will permit it to bear directly against a car axle to maintain sealing engagement therewith without undue friction or wear on the packing.

For a more complete understanding of this invention, reference may b e had to the accompanying drawing in which Figure 1 is a plan view of the fabric strip used in making the packing and shows it indented to receive the core.

Figure 2 is an elevation of the tubular core with its spring center.

Figure 3 is a. planshowing the core of Figure 2 enfolded in the strip of Figure 1.

4o Figures 4 and 5 are perspective views showing further steps in the malnng of the packing.

' Figures 6, 7, and 8 are detail sections on the correspondingly numbered section lines -of Figures 1, 3, and 5, respectively.

5 Figure 9 is a fragmentary view partly in elevation and partly in section of the core member and the means of attaching its ends.

Figure 10 is a central vertical section through a dust guard provided with a packing of this invention, the axle and axle box being shown in dotted lines.

Referring to the drawing, Figure 1 shows a length of bias fabric I such as asbestos with or without a wire reinforcement, as may be desired.

65 the ends of the bias fabric strip being parallel with the strands as shown at 2 and 3, parallel to each other and non-perpendicular to the side edges 4 and 5. In order to facilitate folding this strip longitudinally, for a purpose which will presently appear, a longitudinal indentation may be made substantially centrally ofthe width of the strip as shown'at 6. This may be done as indicated in Figure 6 by passing an indenting roll shown in dotted lines at 8 along the median-line of the strip and preferably over a corresponding indented support 9. A lubricating material which will permit adhesion between the strip and a core member to be wrapped thereinl is then 'preferably applied to the strip along the indented portion. A satisfactory lubricant which will withstand the severe conditions of service is graphite. On this indented portion is then positioned a core member which may comprise a tube of flexible yielding material, such as rubber,

shown at I0 in Figure 2, through which is extended a center contractible member I I. 'Ihis member may well comprise a coil spring and in one end may be threaded a coupling coil I2' of smaller diameter which may be used later to couple the ends ofthe spring together as shown in Figure 9, the spring I2 being threaded into bothA ends of the spring II.

The side margins I5 and IG of the strip I are then brought together around the core member and are secured together as by cementing. It is preferable vnot to apply cement to those portions of the strip which contact with the core, it being desirable to permit sliding motion between the core and the strip. Thel possibility of such sliding motion may be further insured by coating the central portion of the width of the strip with a non-sticky or lubricating material, such as Vgraphite where the core is in contact therewith.

The structure thus formed with the side margins of the strip cemented together is illustrated in Figure 3. Y

Next, this structure is bent into annular form, the ends of the center contractible member being joined together, as previously described and as shown in Figure 9, to form up the structure into the ring form. The parts are of. such relative lengths that when the center spring member is so joined,`the ends of the fabric strip Vmay be brought into overlapping relation, vas

shown in Figure 4, but preferably the ends of the tube Ill are not quite together, thus to permit 'more or less opening up of this member with the spring II thus to provide a desired stretching characteristic to the annular bead portion 20 formed by the core and that portion of the fabric strip in wrapping engagement' therewith. 'Ihe ends of. the fabric strip in overlapping relation are secured together. as by cementing, and over the juncture may be placeda stripof adhesive tapeasshownatliinl'igure.

The structure thus formed/is then preferably subjected .to a pressing operation,lasy shown in ligure), between dies 2i and 2i, the die 2l being shown as flat toren'gage the full width of the overlapped marginsof the fabric strip and the core portion, while the die member 2t is of greater internal diameter soras to permit the bead porden to projectvinternally thereof. The result of this operation is to bring the secured marginsvof 'c the fabric into substantially a single plane with the internal margin of the axle-receiving opening formed as a thickened bead projecting substantially wholly from one face of the secured mardnl Aftertbus being formed up. the packing is subjeeted to treatment with a suitable lubricant such as graphite or the like. which together with the cement by which the layers are secured together, renders the packing` substantially water. oil and -m me uns packing is secured'eowsrdjits outermargininfaeetoface relation witharelatively rigid plate'member ll, shownin Figure 10.

andwhichisprovidedwithanopeningasatii.

this is done. 'Ihis automatic conformation of the bead portion is aided by the nonadhesion of the come strip to the wrapping portion of the fabric.

Prom the foregoing description of the preferred method of making up this packing, it should be vunderstoodbythoseskiliedintheartthatvarious d then prsing the secured layers. of said strip into substantially one plane extending outsaid core piece and the folded portion and interposed core piece laterally of said planeinoilsetrelationtosaid securedlayers.

2. The method of making packing which comtogether with the folded -portion forming an axlewww annulm from which the folded layers of said strip project outwardly substantially in a portion ,isA permitted I plane..andellaettingsaidannulus fromoneface ofmidlayqa.

3.The method of making a packing which veomwisinaiilingalengthofbiasasbestos fabric substantialb centrally of its width, placing insaklindmtatimaeorepieceofyieldingmateriai, ll'inging the ddejsluargin's of said length together. about'mid eosepieee and cementing them togethe in faee to face relation, bringing lthe 'endporiiuuofsaideorepieceandthe endedges of said and respectively securing c and thenpressingrsaid seemed strip margins into substantially ongeplaneandwithsaidcorepieceandthatportion of the strip enclodug said eorepieeeform-l ingathichenedinnermarginforanaxle-receivingopening and projectingsubstantially wholly fromonefaeedfsaidmargins.

prises indenting a length ofbias asbestos fabric substantially centrally of its width. applying a ,lubrinttosaidlellthalongsaidindentedporr tion, placing in said indentation a core piece of yieldingmateriaLhinging the side margins of" said lemthtogetherabout said cere piece and mmm than together-m 'face torace relation. bringingtheendportionsofsaideorepiece and the endedgesof said strip together and rpectivelyvsecuring said portionsfand ends together. acndthenpresaingsaidsecuredstripmarginsinto suhst'antiallyoneplaneandwithsaidcorepiece andthatpuenofthestrip enclosing said corel pieceformingatbickenedinnermarginforan axle-receivingy opening and projecting Vsubstantially wholly from one face of said margins.

5. Themethodofmakingapackingwhicheomprises indenting sulltantialiy centrally of its width a Alength of bias asbestos fabric having non- 4bias placing in said indentation as ay core a'tubeotyieldablematerialcontainingaeontractible center member,'bringingthe edge portionsofsaidlengthinto faeeto face relation and thereeemenngtbesmbrlngingthe endsofthe` lstructure so formed together and securing the ends of said center member together and the ends of saidfabrietogether. the ends of said tube being unattached to each other. and then preing the secured Vvmargins of said fabric into substantially asingle plane with the indented portion and said core forming a thickenedbead about its interior I. Themethodofmakingapackingwhicheom# pris 'indentihg substantially centrally of its width a length'of .bias asbestos fabric having non-` biasr ends, placing in said 'indentation as a core a tube of yieldable material containing a con v tractible center member,y bringing the edge portions of said `length into face to face relation and them, bringing the ends of the ,strueture-soformed together and securing the ends of said center member together and the ends of saidfabrictogether, the ends ofsaid tubs beingunattaebedtoeachother,and thenpressing the secured margins of said fabric into substantially a single phne with the indented portion and said .core forming a thickened bead about its interiorperiphery and rprojecting substantially whoilyfro'monesidefaeeofsaidsecured margins.

7. Themethodofmaking'apacking whichcom- I' priae'indentlnl centrally `0f itl width a lathe! bias asbestos fabric having nonblas ends. placing in said indentation as a'core atubeofyleldahlematerial containingacontractible `bringing thel edge por-` tiomofsddlengthintofacetofacereiationand l 2,110,3 03 there cementing them, bringing the ends of the 1 material, bringingthe side margins of said length together about said core strip and cementing.

them together in face to face relation, bringing the end portions of said core piece and the end.

edges of said strip together and respectively securing said portions and ends together, and then pressing said vsecured strip margins into substantially one plane and withsaid core piece and that portion of the strip enclosing said corev piece forming a thickened inner margin for an axle-receiving opening and projecting substantially wholly from one face of said margins, and then treating said packing with a lubricant.A y

WILLIAM J. MARSHALL. 

